DPP 33 switch setup help

[westernk]

Hi guys i have a pretty simple setup but have a question before I buy a DPP 33 switch.

My current setup
I have 2 BELL model 6131 receivers......looking at sats 91 & 82
I have a DPP PLUS TWIN LNBF
2 wires from the LNB go into my house. 1 of those wires go directly to receiver #1 and the other wire goes to receiver #2

What I want to do
Add a third model 6131 receiver

My research tells me that a DPP 33 switch will do.
I understand that 3 wires will need to exit the DPP 33 switch and go to each of the 3 receivers but I am confused on what needs to go INTO the switch. For all 3 receivers to work I would think that only 1 wire from the LNBF needs to be connected to the LNB in port the DPP33 switch since sats 82 & 91 are already combined by the LNBF?

Thanks in advance